Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Starter Generator
The starter generator, sometimes referred to as the motor generator unit (MGU), is a serviceable 16-pole, permanent magnet, enhanced Lundell AC machine. This device not only serves as a 36-volt AC generator, it is also used to provide engine power assist and to start the engine following hybrid "autostops". 36-volt AC power flows between the starter generator and the generator control module through a 3-phase cable assembly.
As a generator, the starter-generator provides up to 3 KW of AC power to the generator control module power inverter. Field current is provided by the generator control module through a 7-pin connector, and starter generator RPM feedback is transmitted back to the controller through the same connector. Starter generator temperature data is provided to the generator control module through a separate 3-pin connector.
As a motor, the machine provides up to 65 N.m of torque for power assist and engine starting. The motor receives 3-phase AC power from the power inverter within the generator control module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.